Not true, some mobile infra should be on UPS power.
I assume you were not impacted by Storm Arwen?Our area was without electricity for a week (and some much longer)
I can assure you we had no mobile signal, no e-mails, no internet.
Only the old land line phone worked, and very poor FM radio reception on a battery radio.
Phoning powergrid and waiting for an hour or so resulted in a message to visit the website.
It was a shock to realise how reliant we have become on modern communication systems.
Sasdly, I fear the rural population will never be well served.